Valve grinder



Oct. 17, 1944. Q CULP 2,360,550

VALVE GRINDER Filed June 16; 1944 V I Al '9 8, n I 9 3V 4 I Y a 4- /4 /0 A? 1 6 /0 43 L0.czzz,v

INVENTOR.

Patented Oct. 17, 1944 UNITED STATES PATENT orrlce VALVE GRINDER Lide Crocker C'ulp, El Dorado, Ark. Application June 16, 1944, Serial No. 540,673

3 Claims.

This invention relates to a tool designed primarily for grinding valve seats, an object being to provide a structure of this character which can be utilized efficiently for simultaneously grinding opposed valve seats which are either in parallel planes or in converging planes. Heretofore, in order to grind valve seats of this type it has been necessary generally to discard the worn parts or else provide renewable or replaceable seats.

An object of the present invention is to provide a valve seat grinding tool the grinding elements of which, when rotated, are capable of a Wobble motion whereby they can maintain themselves at all times in contact with the opposed inclined seats being treated.

A further object is to provide a tool which can be readily placed in position, is simple in construction, and can be operated either by hand or by motor.

With the foregoing and other objects in View which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form of the invention has been shown.

In said drawing Figure 1 is' a longitudinal section through a valve casing showing the tool in position.

Figure 2 is a section on line 2-2, Fig. 1.

Referring to the figures by character-s of reference, l designates a valve casing having opposed seats 2 which, in the present instance, are disposed in planes which are not parallel.

The tool constituting the present invention and which is especially designed for use in grinding valve seats of the type disclosed, includes a shaft 3 of sufficient length to extend entirely through the valve casing, this shaft being provided with any suitable means whereby it can be rotated. For example the shaft could be provided with a crank 4 so that rotation could be effected by hand. Obviously, however, a motor could be suitably connected to the shaft.

At a point between its ends the shaft is provided with a radial opening 5 into which is screwed a stud 6 one end of which is extended radially from the shaft. This projecting end is preferably angular in cross-section as indicated at l and is extended across an elongated coupling pin 8 the ends of which are extended loosely through openings 9 formed in grinding disks ID. These grinding disks have central openings l I through which the shaft 3 is extended loosely so that the disks can assume various angles relative to the shaft.

A coiled spring I2 is mounted on that portion of the shaft between the disks and is also extended around the pin 8. This spring serves to press the disks away from each other so that when they are interposed between the valve seats, they can be forced thereagainst to fit them snugly. The diameter of the disks is of course substantially equal to that of the valve seats.

Supporting plugs l3, which can be formed of wood, are proportioned for insertion into the opposed arms or ends of the valve casing, it being understood that these are driven into position and are kept in place by friction. Each plug 13 has an opening M extending therethrough into which the shaft 3 can rotate freely.

In practice the opposed grinding disks are inserted into the valve casing through the inlet I5 so that they thus will be located between the two valve seats. The spring is interposed between the disks, and shaft 3 and pin 8 are then inserted into the disks and the spring after which the plugs 53 are driven into position. By means of any suitable wrench, the stud 6 is inserted into the opening 5 in the shaft so that it will extend radially past the pin 8. After the parts thus have been assembled the disks obviously are held pressed firmly against the valve seats. By then rotating the shaft in one direction, the stud will push against the pin and this pin, in turn, will cause the disks to rotate with the shaft. As the disks are held yieldingly pressed against the valve seats, the rotation of the disks with the shaft will cause said disks to change their angles relative to the shaft inasmuch as they are free to have a rocking motion thereon in any direction. Thus the disks will be kept in contact with the valve seats and will gradually grind them to a correct finish.

The parts can readily be removed by reversing between the disks for holding them pressed yieldingly against opposed valve seats, and means for transmitting rotary motion to the disks from the.

shaft.

2. A tool for grinding valve seats including a shaft mounted for rotation in a valve casing, Wobble disks loosely mounted on the shaft and constituting grinding elements, means interposed between the disks for holding them pressed yieldingly against opposed valve seats, and means for 10 transmitting rotary motion to the disks from the shaft, said means including a coupling pin extended loosely through the disks, and a radial stud on the shaft positioned to transmit thrust against the pin when the shaft is rotated.

LIDE CROCKER CULP. 

